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Bearing speed limit and reference speed

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The speed of the bearing is mainly limited by the temperature rise caused by the conflict heat inside the bearing; when the speed exceeds a certain boundary; the bearing will not rotate continuously due to burns, etc. The limit speed of the bearing means that there is no conflict to cause burns and heat. The boundary value of the rotation can be successively rotated. Therefore, the limit speed of the bearing depends on the type, scale and precision of the bearing, as well as the smoothing method, the quality and quantity of the smoothing agent, the data and type of the cage, the load conditions, etc. The limit speed when the grease is smooth and the oil is smooth (the oil bath is smooth) is not shown in the bearing scale table; its value indicates that the bearing depicted in the specification is under normal load conditions (C/P>=13, Fa /Fr<=0. 25 or so) The boundary value of the rotation speed when rotating. Others; the smoothing agent is different according to its variety and trademark; it can also be used for high-speed rotation although it is superior to other functions.
The rated speed of the limit speed is C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the fundamental additional dynamic load C); or the axial load in the accepted component load exceeds 25% of the radial load; The following formula corrects the limit speed.
Na=f1*f2*n
Na: limit speed after correction; rpm
F1: correction coefficient f2 related to load conditions: correction coefficient n related to the composition load: limit rotation speed under normal load conditions; rpm
C: fundamental extra dynamic load; N{kgf}
P : equivalent dynamic load; N{kgf}
Fr: radial load; N{kgf}
Fa: axial load; N{kgf}
The limit speed of the ball bearing with seal ring bearing with the touch seal (RS type) ball bearing limit speed is bound by the touch surface speed of the seal ring; the line speed depends on the rubber material of the seal ring.
High-speed rotation focuses on the bearing at high speed rotation, especially when the speed is close to or exceeds the limit speed recorded in the scale table; the first thing to focus on is as follows:
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In order to facilitate comparison with sliding bearings; the conflicting moment of rolling bearings can be calculated according to the inner diameter of the bearing:
M=uPd/2
M: collision torque; mN. m{kgf. Mm}
u: conflict coefficient; Table 1
P: bearing load; N{kgf}
d: nominal bearing inner diameter; mm
The conflict coefficient u is greatly affected by the bearing type, bearing load, rotational speed, smoothing method, etc. The reference values ​​of the conflict coefficient when the rotation is stable under normal conditions are shown in Table 1. Regarding the sliding bearing; usually u=0.01-0. 02; sometimes also reaches 0. 1-0. 2.
Conflict coefficient of various types of bearings, bearing type friction coefficient μ
Deep groove ball bearings 0. 0010-0. 0015
Angular touch ball bearing 0. 0012-0.0020
Self-aligning ball bearing cylindrical roller bearing 0.0008-0.0012
Full complement needle roller bearings 0. 0025-0. 0035
Needle bearing with cage 0.0020-0.0030
Tapered roller bearings 0. 0017-0. 0025
Spherical roller bearings 0. 0020-0. 0025
Thrust ball bearings 0. 0010-0. 0015
Thrust spherical roller bearings 0. 0020-0. 0025

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